Heat oil in a Kadhai/cooking pot/wok.Add the onions and ginger-garlic paste and saute till they become translucent. Add the tomatoes and green chilli peppers and saute till it becomes almost brown.Add the chicken pieces.Toss and stir till the oil seperates.Add the Cashewnut paste, powdered spice,salt and 1/2 cup of water.Mix well.Cover and cook for sometimes to see the chicken is tender.Serve hot.